CN100424912C - Sealed cell - Google Patents
Sealed cell Download PDFInfo
- Publication number
- CN100424912C CN100424912C CNB2004100865972A CN200410086597A CN100424912C CN 100424912 C CN100424912 C CN 100424912C CN B2004100865972 A CNB2004100865972 A CN B2004100865972A CN 200410086597 A CN200410086597 A CN 200410086597A CN 100424912 C CN100424912 C CN 100424912C
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- China
- Prior art keywords
- battery
- top part
- circular top
- valve body
- hush panel
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- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 239000003792 electrolyte Substances 0.000 abstract description 16
- 238000007789 sealing Methods 0.000 abstract description 3
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- 229910000838 Al alloy Inorganic materials 0.000 description 5
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
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- 238000003466 welding Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- GAEKPEKOJKCEMS-UHFFFAOYSA-N gamma-valerolactone Chemical compound CC1CCC(=O)O1 GAEKPEKOJKCEMS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000011255 nonaqueous electrolyte Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 1
- AMGYRYIYJGLHRO-UHFFFAOYSA-N COCCOCCOC.COCCOC.O1CCCC1 Chemical compound COCCOCCOC.COCCOC.O1CCCC1 AMGYRYIYJGLHRO-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910015015 LiAsF 6 Inorganic materials 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910012820 LiCoO Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910010586 LiFeO 2 Inorganic materials 0.000 description 1
- 229910015645 LiMn Inorganic materials 0.000 description 1
- 229910013292 LiNiO Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical class CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 150000005676 cyclic carbonates Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present invention provides a sealed cell with a safety mechanism. The safety mechanism has a non-resealable valve structure formed in a sealing plate that seals the cell. The valve structure is broken as soon as the internal pressure reaches or exceeds a predetermined value so as to permit the internal gas to be released outside. The safety mechanism is characterized in that the valve structure has at least one dome protruding toward the interior of the cell, which in turn has a break groove for facilitating the breakage of the valve structure at the periphery thereof. By means of the cell, it is able to reduce motion pressure difference of each cell safety mechanism, at the same time to ensure adequate opening area for the motion of safety mechanism, moreover it is able to prevent electrolyte from leaking due to concussion such as dropping off etc.
Description
Technical field
The present invention relates to a kind of enclosed-type battery that release mechanism is installed, described release mechanism is to form the release mechanism that opening is discharged the gas in the battery by the valve body fragmentation when inner pressure of battery rises that is formed at the thin-walled in the battery outsourcing tinning.
Background technology
In recent years, the miniaturization and of personal digital assistant devices such as portable phone, notebook computer, PDA develops rapidly, also further requires high capacity, high-energy-densityization certainly for the battery as its driving power.With the lithium rechargeable battery is the rechargeable nonaqueous electrolytic battery of representative owing to have high-energy-density, the capacity height, therefore the driving power that is used as personal digital assistant device extensively utilizes, because the driving power of using as personal digital assistant device is easily mounted on machine intimate, so rectangular cell is widely used.
But rechargeable nonaqueous electrolytic battery is being exposed under the situation of high temperature or is carrying out under inappropriate situation about discharging and recharging, and produce gas owing to the reaction of electrode and electrolyte makes electrolyte decomposition, so inner pressure of battery rises.When the rising of inner pressure of battery is carried out, just have the danger that makes cell fracture.So, be necessary to reach and the gas in the battery promptly emitted before breaking outside battery at battery.
So the technology of emitting outside battery rapidly as the gas that makes in the battery proposes to have various technology such as groove that can damaged cracking when being arranged on inner pressure of battery rising on the cell sealing plate (for example with reference to patent documentation 1～4.)。
[patent documentation 1] opens clear 63-167669 communique in fact
No. 3222418 communique of [patent documentation 2] patent
[patent documentation 3] spy opens the 2001-325934 communique
[patent documentation 4] spy opens flat 10-261391 communique
Technology according to patent documentation 1, by forming the thinner wall section that forms by the ring-type slot part that becomes the different chock top of facing mutually of concentric circles and diameter, just can battery reach break before, make the thinner wall section breakage, thereby gas in the battery or fused mass are very successfully emitted in atmosphere, improve fail safe.But owing to do not concentrate on the described V-shaped groove with respect to the stress of the internal pressure of battery, so the operating pressure difference of the release mechanism of each battery increases, and resistance to impact reduces in addition, thereby the problem that makes ring-type slot part breakage leakage because of impact such as drop is arranged.
Technology according to patent documentation 2, record following technology, the hush panel of the enclosed-type battery by using following formation, promptly, the metallic plate of peristome by the container of sealing enclosed-type battery is made, surface at this metallic plate forms groove along the profile around specific zone, be formed on this groove simultaneously inboard continuously and the bellying that bloats to the face side of described metallic plate, when the excessive and pressure that be under pressure at bellying of the interior pressure of enclosed-type battery surpasses specific pressure, the slot part of hush panel will rupture, make bellying open thus, thereby make it to be communicated with space outerpace.According to this technology, though the fail safe of battery is enhanced, the problem that has following resistance to impact to reduce in this technology promptly, makes groove or valve body injured because of impacting to wait, crack etc., thus leakage etc. easily.
Technology according to patent documentation 3, record the safety valve of following battery, promptly, on the tabular hush panel of sealed cell, be formed with the valve body of thin-walled, when cell internal pressure reaches particular value when above, described valve body fragmentation, gas in the battery is emitted outside battery, it is characterized in that, on described valve body, form the circular top part make domed shape, and at the central portion of valve body or be formed with near it and be used to the broken groove that makes valve body broken easily.According to this technology, the operating pressure of safety valve that can reduce each battery is poor, can guarantee enough open area when safety valve moves, and can prevent electrolyte leakage etc.But, there is also a desire for further improvement for the resistance to impact of broken groove.
According to the technology of patent documentation 4, the V-shaped groove by being provided for preventing on the battery medial surface of battery cover breaking when cell internal pressure rises, is rising under the situation that is higher than specific pressure, just can promptly discharge this pressure.But, owing to concentrate on the described V-shaped groove, therefore there is the operating pressure difference of the release mechanism of each battery to become big with respect to the stress of the internal pressure of battery, can make problems such as ring-type slot part breakage leakage because of impact such as drop in addition.
Summary of the invention
The present invention proposes in view of described situation, purpose is, the following enclosed-type battery that release mechanism is installed is provided, promptly, the operating pressure of release mechanism that can dwindle each battery is poor, when release mechanism moves, can guarantee enough open area, and can prevent because of situations such as making electrolyte leakage such as impacting.
In order to reach described purpose, the present invention has at the valve body that forms thin-walled on the hush panel of sealed cell and at cell internal pressure to reach particular value broken and enclosed-type battery of release mechanism that the gas in the battery is emitted of described valve body when above outside battery, it is characterized in that, on described valve body, form at least one side-prominent in battery circular top part, at least one periphery of described circular top part, be formed with the broken groove that is used to make the easy fragmentation of valve body.
In addition, the present invention can adopt described broken groove is formed at formation on the battery medial surface of described hush panel.
In addition, the present invention can adopt described valve body integral body and the lateral surface of described hush panel be conplane imaginary plane and and the medial surface of described hush panel be formation between the conplane imaginary plane.
In addition, the present invention can adopt the formation that the residual wall thickness of described broken groove is limited in 15～80 μ m.
When inside battery side direction hush panel is exerted pressure, the stress of the distortion that is brought by inner pressure of battery will be concentrated the periphery that acts on circular top part.Though compare to the outstanding situation of battery foreign side with circular top part, under the circular top part situation that give prominence to the side in battery, this stress is bigger, according to described formation of the present invention, circular top part side in battery is outstanding, and is formed with broken groove at its periphery.So,, therefore when action being pressed the identical pressure of the battery that is set at the release mechanism that has adopted technology in the past, can make the residual wall thickness increase of broken groove because powerful shear action is on the broken groove of the periphery of being located at circular top part.Like this, according to the present invention, the enclosed-type battery that can be achieved as follows promptly, can be guaranteed the fail safe of battery, and can prevent to make because of impact such as drop the situation of the broken and leakage of broken groove.
In addition, when described valve body integral body be positioned at lateral surface with described hush panel be conplane imaginary plane and with the medial surface of described hush panel be in the middle of the conplane imaginary plane time, because anchor clamps etc. directly do not contact with valve body, therefore when battery is assembled, just can not wait damaged because of being subjected to impact.
In addition, the residual wall thickness of described broken groove preferably is restricted to 15～80 μ m.Because when the residual wall thickness of described broken groove during less than 15 μ m, with regard to because of impacting to wait leakage taking place easily, when greater than 80 μ m, then the action of broken groove is pressed excessively, so battery just might break before the breakage of broken groove, so not ideal enough.
Description of drawings
Fig. 1 is the stereogram of battery of the present invention.
Fig. 2 is the A-A alignment pseudosection of Fig. 1, and Fig. 2 (a) is a part sectioned view, and Fig. 2 (b) is the enlarged drawing of release mechanism.
Press the key diagram of the operate condition of the release mechanism when rising in Fig. 3 expression battery of the present invention.
Fig. 4 is that to make battery of the present invention be the key diagram of the state of below when dropping with the negative terminal.
Fig. 5 be expression circular top part of battery of the present invention and valve body variation want portion's amplification plan view.
Fig. 6 is the profile of variation of formation position of the broken groove of expression battery of the present invention.
Fig. 7 be the expression comparative example battery in press the key diagram of the operate condition of the release mechanism when rising.
Fig. 8 is that to make the battery of comparative example be the key diagram of the state of below when dropping with the negative terminal.
Wherein, 1: battery, 2: circular top part, 4: broken groove, 6: hush panel, 7: electrode body, 8: the outsourcing tinning, 6: hush panel, 9: release mechanism, 10: negative terminal, 11: liner, 12: insulation board, 14: conductive plate, 15: anode connector (tab), 16: liquid injection hole, 17: open bore, 18a: imaginary plane, 18b: imaginary plane, 20: the liquid injection hole hush panel
Embodiment
Be used to implement best mode of the present invention and describe according to Fig. 1,2 couples below.Fig. 1 is the vertical view of release mechanism of the present invention, and Fig. 2 is the A-A alignment pseudosection of Fig. 1.
Nonaqueous electrolyte battery of the present invention has the outsourcing of end shape tinning 8 is arranged, and in this outsourcing tinning 8, takes in the electrode body 7 of the flat wound shape that constitutes by positive pole, negative pole, with the barrier film of these two electrode isolation.In addition, in described outsourcing tinning 8, be injected with electrolyte.In addition, on the open bore of described outsourcing tinning 8 Laser Welding be connected to the hush panel 6 made by aluminium alloy (thickness: 1mm), thus with battery seal.
Described hush panel 6 is by liner 11, insulation board 12 and conductive plate 14 and negative terminal clamping.In addition, extend the anode connector 15 that is provided with from described negative pole and be electrically connected with negative terminal 10 by described conductive plate 14, on the other hand, described positive pole is electrically connected with described outsourcing tinning 8 by positive terminal (not shown).In addition, on hush panel 6, be formed with the liquid injection hole 16 that is used to inject electrolyte, after electrolyte injects, seal by liquid injection hole hush panel 20.
Here, on described hush panel 6 and described insulation board 12, be formed with open bore 17, on this open bore 17, as shown in Figures 1 and 2, be provided with that valve body by thin-walled forms and with the described hush panel 6 integrated release mechanisms that form 9 (making by aluminium alloy in the same manner) with hush panel 6.This release mechanism 9 is formed on cell internal pressure can be broken when particular value is above and structure that the gas in the battery is emitted outside battery.Be formed with on described valve body that in battery side direction bloats and the circular top part 2 that forms domed shape, be formed with at the periphery of this circular top part 2 and be used to the broken groove 4 that makes valve body broken easily.In addition, release mechanism 9 integral body are formed at and the conplane imaginary plane 18a of lateral surface 6a of described hush panel 6 and and the conplane imaginary plane 18b of medial surface 6b of described hush panel 6 between.
(embodiment 1)
At first, will be as the LiCoO of positive active material
290 mass parts, as carbon black 5 mass parts of conductive agent, as Kynoar 5 mass parts of binding agent, mix and after being modulated into slip as N-methyl-2 pyrrolidones (NMP) solution of solvent, described slip is coated on two sides as the aluminium foil of positive electrode collector.Thereafter, at dry solvent, be compressed to specific thickness with cylinder after, cut into the width and the length that reach specific, and then the anodal current collection joint of welding aluminum alloy system.
Carry out simultaneously with it, will be as powdered graphite 95 mass parts of negative electrode active material, as Kynoar 5 mass parts of binding agent, mix and after being modulated into slip as the nmp solution of solvent, described slip is coated on two sides as the Copper Foil of negative electrode collector.Thereafter, at dry solvent, be compressed to specific thickness with cylinder after, cut into the width and the length that reach specific, and then the negative pole current collection joint of welding nickel system.
Then, described positive pole and negative pole folder is reeled every the barrier film of being made by polyethylene system perforated membrane, made the electrode body 7 of flat wound shape after, in these electrode body 7 insertion outsourcing tinnings 8.
On the other hand, carry out simultaneously with described operation, forge after processing (plastic working a kind of) formed thin plate part in the ad-hoc location utilization of hush panel, implement embossing processing (plastic working a kind of) at this plate part, broken groove 4 and circular top part 2 are set, have made release mechanism 9 (with reference to Fig. 2) with hush panel 6 integrated formation.According to make circular top part to battery in side-prominent mode, utilize conductive plate 14 and negative terminal 10 clamping hush panel 6, liner 11, insulation board 12 thereafter.
Afterwards, after with outsourcing tinning 8 and hush panel 6 laser welding,, liquid injection hole 16 is sealed, made the battery of embodiment 1 with liquid injection hole hush panel 20 by in external packing jar 8, injecting electrolyte.And the residual wall thickness of broken groove 4 is 30 μ m.
(embodiment 2)
Except the residual wall thickness with broken groove 4 is made as 45 μ m, made the battery of embodiment 2 in the same manner with described embodiment 1.
(comparative example 1)
As shown in Figure 7, outstanding except making circular top part to the battery outside, beyond from the battery outside broken groove being processed, made the battery of comparative example 1 in the same manner with described embodiment 1.
(the action compacting is tested)
Release mechanism to embodiment 1,2, comparative example applies direct pressure, the pressure when having measured the action of broken groove (action of broken groove is pressed).Experimental result is illustrated in the following table 1.And the sample number is 20 on each battery.
Table 1
Can know from described table 1 and to see that the action of embodiment 1 flattens and is 1.73MPa, compare with the average 2.41MPa of the comparative example 1 of identical residual wall thickness, with the pressure action of about little 0.7MPa.See that in addition residual wall thickness is that the action pressure of embodiment 2 of 45 μ m and comparative example that residual wall thickness is 30 μ m determine that action presses about equally.
The result of the stress distribution analysis of the release mechanism when utilizing simulation subtend release mechanism to exert pressure shows that the side of embodiment compares with comparative example, and stress is easier to be concentrated on the broken groove.Use Fig. 3,7 to be described.Fig. 3 is the key diagram of operate condition of the release mechanism of embodiment, and Fig. 7 is the key diagram of operate condition of the release mechanism of comparative example.
When from when the inside battery side of the circular top part 102 of the outstanding comparative example 1 in the battery outside is exerted pressure, inner pressure of battery will be concentrated and act on circular top part 102.Consequently, shown in Fig. 7 (d), in press according to making the further outstanding modes of circular top part 102 come the active force power of upward arrow (among the figure to), deformation force (power of left and right directions arrow among the figure) is according to the mode effect that utilizes the power that this circular top part 102 is pushed to that the area of plane of the periphery of circular top part is shunk.But circular top part self is fixed on the valve body of thin-walled, also acts on the valve body of this thin-walled because of the power that pushes away on the interior pressure.Though the stress that is produced by these power makes broken groove fragmentation, because this stress is shown in Fig. 7 (b), the direction equal distribution, so stress can not concentrate on the periphery of circular top part 102 fully.So,, need bigger pressure for broken groove 104 fragmentations (with reference to Fig. 7 (c)) that make the periphery that is formed at circular top part.
On the other hand, when exerting pressure from the inside battery side of the circular top part 2 of embodiment side-prominent in battery 1, though can concentrating, inner pressure of battery acts on circular top part, but shown in Fig. 3 (d), the power power of upward arrow (among the figure to) is according to the mode effect that utilizes internal pressure that circular top part 2 is pushed to and made it to reverse, utilization makes the power of this circular top part counter-rotating, and deformation force (power of left and right directions arrow among the figure) is according to the mode effect of the area of plane expansion of the periphery that makes circular top part.But circular top part self is fixed on the valve body of thin-walled, also acts on the circumference of circular top part because of the power that pushes away on the interior pressure.Because the stress that produces because of these power is shown in Fig. 3 (b), effect round about, so stress just is concentrated in the periphery of circular top part 2.So, will on the broken groove of being located on the periphery of this circular top part 4 (with reference to Fig. 3 (c)), apply stronger shearing force.So, just diminish in order to make the broken necessary pressure of broken groove (embodiment 1 and comparative example 1) with identical residual wall thickness, in addition, when being set at same action and pressing (embodiment 2 and comparative example 1), just can increase the residual wall thickness of broken groove.
In addition we know, the deviation that the action of broken groove is pressed all is 0.16～0.23MPa in embodiment, comparative example, and the deviation that action is pressed is all less.This is because by forming circular top part, interior pressure can be concentrated and act on circular top part.
Below, press the basic embodiment 2 that equates, the battery of comparative example 1 under following condition, to carry out falling body experiment to action, compared impact resistance.
(falling body experiment)
The battery that makes embodiment 2, comparative example 1 from specific height respectively with its front, the back side, right flank, left surface, above, the bottom surface drops to falling platform towards the below, with its 6 times drops, utilize the visual period of having measured when the valve body leakage takes place that drops as 1 circulation.Experimental result is illustrated in the following table 2.And the sample number is 10 on each battery.
Table 2
| |
Comparative example 1 | |
| Groove processing dome towards | Process in battery from battery is inboard | Process outside battery from the battery outside |
| The falling body experiment period | Average 37.3 (32～41) | Average 24.1 (20～31) |
As can be seen from Table 2, the cycle-index that drops of embodiment 2 is 37.3 (32～41), and is relative with it, is 24.1 (20～31) in the comparative example 1, and the above bigger difference of circulation is arranged 13 times.
This is considered to because following reason.The fragmentation of the broken groove that forms because of impact is to be caused by different mechanisms with the fragmentation of the broken groove that forms of rising because of internal pressure, because of the residual wall thickness difference of broken groove is a greater impact.Here, the residual wall thickness of the battery of embodiment 2 is 45 μ m, compares greatlyyer with 30 μ m of comparative example 1, so impact resistance is higher than comparative example 1.
In addition, (face that hush panel was positioned at) is when dropping downwards above the battery that makes circular top part outstanding comparative example outside battery, as shown in Figure 8, remaining electrolyte will remain in the circular top part, thereby make broken groove fragmentation easily, in contrast, in the battery of circular top part side-prominent embodiment in battery, when make battery above (face that hush panel was positioned at) when dropping downwards, as shown in Figure 4, because electrolyte only remains in the periphery of the less circular top part of volume, so electrolyte is to circular top part, the influence that broken groove causes is less, and this also is considered to a reason.
[other item]
And, among the described embodiment,, the number of circular top part is made as 2 though the plan view shape of release mechanism 9 is made as ellipse, its plan view shape is made as ellipse, be not limited thereto.In addition, the number of circular top part, groove towards not limited by described embodiment.For example, also can be as shown in Figure 5, the plan view shape of release mechanism is made as polygonal, their circular top part is made as ellipse, polygonal, positive circular, unsetting, also can change the number of circular top part.In addition, for the position on the valve body that is formed at thin-walled also without any qualification.In these shapes, consider the shape (just except the circle) that the preferred oval or egg type as Fig. 5 (e) shown in etc. are made of curve from the viewpoint of the concentrating of stress, broken easness.
In addition, as shown in Figure 6, both can also can comprise the inboard both sides in the outside from the broken groove of battery outside processing.In addition, when a plurality of circular top part is set,, also can be formed on the circular top part that there is not broken groove in periphery as long as on the periphery of at least one circular top part, form broken groove.In addition, the manufacture method of broken groove, circular top part is not limited to the method shown in the described embodiment.
In addition, the thickness of the valve body of release mechanism 9 is so long as 0.1～20% scope, 40～100 μ m of hush panel thickness just can obtain good result.
In addition, the material as hush panel 6 and release mechanism 9 is not limited to aluminium alloy, also can use iron, stainless steel, fine aluminium etc.Wherein, when using lighter fine aluminium or aluminium alloy, because the raising of weight energy density is therefore preferred.In addition, the present invention is not limited to rechargeable nonaqueous electrolytic battery, can use in nonaqueous electrolyte primary cell etc.
In addition, if the residual wall thickness of broken groove is then might resistance to impact not enough, therefore not ideal enough less than 15 μ m.In addition, in order to improve resistance to impact, more than the preferred 30 μ m.In addition, when greater than 80 μ m because broken necessary pressure is excessive, before broken groove fragmentation with regard to have because of in press the danger that rises fragmentation etc., so below the preferred 80 μ m.
In addition, in the time of in applying the present invention to described nonaqueous electrolytic solution secondary battery, as positive electrode, except described LiCoO
2In addition, for example can use LiNiO suitably
2, LiMn
2O
4, LiFeO
2Perhaps their mixture, contain the compound etc. of other element at the lattice of these compounds, in addition, as negative material, except material with carbon element, can use lithium metal, lithium alloy suitably or can inhale metal oxide (tin-oxide etc.) that storage breaks away from lithium ion etc. or their mixture.
In addition, solvent as electrolyte, be not limited to described example, can with propene carbonate ethylene carbonate butylene vinylene carbonate be representative cyclic carbonate, with the gamma-butyrolacton gamma-valerolactone be representative lactone, with diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate be the linear carbonate of representative, with oxolane 1,2-dimethoxy-ethane diethylene glycol dimethyl ether 1,3-two oxa-s penta ring 2-methoxyl group oxolane Anaesthetie Ether are that the ether of representative etc. is used alone or in mixture of two or more.In addition, as the electrolyte of electrolyte, except described LiPF
6In addition, can use LiAsF
6, LiClO
4, LiBF
4, LiCF
3SO
3, LiN (CF
3SO
2)
2Deng.
[industrial utilize possibility]
As above shown in the explanation, according to the present invention, the operating pressure of release mechanism that can dwindle each battery is poor, can when moving, guarantee release mechanism enough open area, and have the excellent effect that can prevent because of the phenomenon of impact electrolyte leakages such as dropping, very large meaning is arranged on the industry.
Claims (4)
1. enclosed-type battery, it is the enclosed-type battery that release mechanism is housed, described release mechanism, be to reach particular value broken and release mechanism that the gas in the battery is emitted of described valve body when above outside battery at the valve body that forms thin-walled on the hush panel of sealed cell and at cell internal pressure, it is characterized in that, on described valve body, form at least one side-prominent in battery circular top part, at least one periphery of described circular top part, be formed with the broken groove that makes valve body broken easily.
2. enclosed-type battery according to claim 1 is characterized in that, described broken groove is formed on the battery medial surface of described hush panel.
3. enclosed-type battery according to claim 1 and 2 is characterized in that, described valve body integral body and the lateral surface of described hush panel be conplane imaginary plane and and the medial surface of described hush panel be between the conplane imaginary plane.
4. according to claim 1,2 or 3 described enclosed-type batteries, it is characterized in that the residual wall thickness of described broken groove is restricted to 15～80 μ m.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003373604A JP4953551B2 (en) | 2003-10-31 | 2003-10-31 | Sealed battery |
| JP2003373604 | 2003-10-31 | ||
| JP2003-373604 | 2003-10-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1612375A CN1612375A (en) | 2005-05-04 |
| CN100424912C true CN100424912C (en) | 2008-10-08 |
Family
ID=34420253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100865972A Active CN100424912C (en) | 2003-10-31 | 2004-10-19 | Sealed cell |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7687188B2 (en) |
| EP (1) | EP1528612B1 (en) |
| JP (1) | JP4953551B2 (en) |
| KR (1) | KR101028621B1 (en) |
| CN (1) | CN100424912C (en) |
| DE (1) | DE602004031914D1 (en) |
Cited By (1)
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|---|---|---|---|---|
| CN103094510A (en) * | 2011-11-03 | 2013-05-08 | 中山天贸电池有限公司 | Lithium ion battery with explosion-proof device and processing method thereof |
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| JP5096671B2 (en) * | 2005-09-13 | 2012-12-12 | 日立マクセルエナジー株式会社 | Sealed prismatic battery |
| KR100948971B1 (en) * | 2005-09-28 | 2010-03-23 | 주식회사 엘지화학 | Prismatic Secondary Battery Including Safety Device |
| KR100968051B1 (en) * | 2005-11-03 | 2010-07-08 | 주식회사 엘지화학 | Cylindrical Type Secondary Battery of Improved Stability against Overcharge |
| KR100719733B1 (en) | 2005-12-23 | 2007-05-17 | 삼성에스디아이 주식회사 | Re-chargable battery having electrolyte upstream preventing thin film |
| KR100880321B1 (en) * | 2006-12-14 | 2009-01-28 | 삼성에스디아이 주식회사 | Secondary battery |
| JP5094215B2 (en) * | 2007-05-30 | 2012-12-12 | 三洋電機株式会社 | Battery and battery pack |
| WO2010116504A1 (en) | 2009-04-09 | 2010-10-14 | トヨタ自動車株式会社 | Battery, vehicle, and equipment using battery |
| US9246140B2 (en) * | 2009-07-09 | 2016-01-26 | Samsung Sdi Co., Ltd. | Rechargeable battery with a cap assembly having a first tab located outside of the case |
| US8877361B2 (en) * | 2009-09-01 | 2014-11-04 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| US9362587B2 (en) * | 2010-02-05 | 2016-06-07 | Panasonic Intellectual Property Management Co., Ltd. | Rectangular battery |
| CN102208677A (en) * | 2010-03-29 | 2011-10-05 | 深圳市比克电池有限公司 | Pressure release device and assembly of secondary lithium ion battery and cell cover |
| US9118061B2 (en) | 2010-08-13 | 2015-08-25 | Samsung Sdi Co., Ltd. | Secondary battery |
| US9478774B2 (en) | 2010-12-02 | 2016-10-25 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| KR101274806B1 (en) | 2011-07-26 | 2013-06-13 | 로베르트 보쉬 게엠베하 | Rechargeable battery |
| US9634299B2 (en) | 2011-09-06 | 2017-04-25 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| KR101683210B1 (en) * | 2011-11-17 | 2016-12-07 | 삼성에스디아이 주식회사 | Rechargeable battery |
| JP5461610B2 (en) * | 2012-03-22 | 2014-04-02 | 三菱重工業株式会社 | Battery and battery system |
| US8991232B2 (en) * | 2012-07-17 | 2015-03-31 | Sanyo Electric Co., Ltd. | Sealing plate for prismatic secondary battery, method for producing the same, and prismatic secondary battery using the same |
| JP5990064B2 (en) * | 2012-08-21 | 2016-09-07 | 小島プレス工業株式会社 | Secondary battery case and secondary battery |
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| JP5928434B2 (en) * | 2013-10-31 | 2016-06-01 | Smk株式会社 | Cold forging method and explosion-proof valve for thin-walled parts |
| JP6299243B2 (en) * | 2014-02-05 | 2018-03-28 | 株式会社Ｇｓユアサ | Storage element and safety valve |
| JP7025861B2 (en) | 2017-08-22 | 2022-02-25 | 大和製罐株式会社 | Seal plate |
| KR102432481B1 (en) | 2018-01-19 | 2022-08-16 | 삼성전자 주식회사 | electronic device and method for sensing condition of battery |
| WO2022006901A1 (en) * | 2020-07-10 | 2022-01-13 | 宁德时代新能源科技股份有限公司 | Battery case, battery cell, battery, and method and apparatus for manufacturing battery case |
| JP2022114916A (en) * | 2021-01-27 | 2022-08-08 | 東洋製罐株式会社 | Safety valve, battery case, and forming method of safety valve |
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- 2004-10-28 DE DE602004031914T patent/DE602004031914D1/en active Active
- 2004-10-28 EP EP04256667A patent/EP1528612B1/en active Active
- 2004-10-28 US US10/974,748 patent/US7687188B2/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| EP1528612A3 (en) | 2008-11-26 |
| EP1528612A2 (en) | 2005-05-04 |
| KR20050041934A (en) | 2005-05-04 |
| JP2005135873A (en) | 2005-05-26 |
| US7687188B2 (en) | 2010-03-30 |
| EP1528612B1 (en) | 2011-03-23 |
| DE602004031914D1 (en) | 2011-05-05 |
| KR101028621B1 (en) | 2011-04-11 |
| US20050112455A1 (en) | 2005-05-26 |
| JP4953551B2 (en) | 2012-06-13 |
| CN1612375A (en) | 2005-05-04 |
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